134 LINN^AN ARTIFICIAL SYSTEM. 



This single plant, is the butomus umbellatns or common flower- 

 ing-rush, a great ornament to our rivers and pools. 



GLASS X. DECANDRIA. 



55. Character: Here we have arranged, all plants 

 vrhich bear flowers with ten stamens. (F. 183.) 



The class decandria is very extensive, and possesses many genera 

 similar in their natural characters. For example, sophora, and bean- 

 trefoil with some other genera, belong to the natural order papilio- 

 naceee. Judas-tree, mountain-ebony, locust-tree, flower-fence, ade- 

 nanthera, guilaudina, ctesalpinia, cassia, logwood and some others 

 belong to the natural order lomentacea:. Beard-tree, mahogany- 

 tree Barbadoes-cherry, and banisteria, are of the natural order trihi- 

 latee. Gnaiacum, tribulus, fagonia, bean'caper, quassia, dionoea, 

 oxalis, averrhoa, and others, of the order gruinalet. Clethra, pyrola, 

 ledum, andromeda, rose-bay, kalmia, epigsea, gaultlieria, arbutus, and 

 storax, of the natural order bicornes. Hydrangea, chrysosplenium, 

 saxifrage, tiarella, mitella, cotyledon, sedum,penthorum, and bergia, 

 are arranged in the natural order succulentcc. Lastly, gysophila, 

 saponaria, dianthus, arenaria, stellaria, cucubalus, silene, spergula, 

 cerastium, agrostemma, lychnis, and others, will be found in the 

 order caryophylleee. 



56. Division: The class decandria is subdivided 

 into five orders ; viz. monogynia, digynia, trigynia, pen- 

 tagynia, and decagynia, all founded on the number of 

 pistils in each flower. 



57. Monogynia: In this order are arranged such 

 plants of the class, as produce flowers with one pistil 

 only. 



Among the plants of this order, we have families of the bean-tre- 

 foil, Judas-tree, mountain-ebony, cassia, fraxinella, rue, logwood, 

 mahogany-tree, quassia, rose-bay, winter-gretn, and others. The 

 singular plant called dionaea muscipnla or Vcnus's fly-trap, is also 

 of this class and order. 



